Ondansetron Injection 2/mg/mL Single-Dose Vial 2 mL, 25/Box by Pfizer (Rx)Pfizer Ondansetron for Injection Single Dose Vial 2 mL is a highly effective and widely used medication for the management of nausea and vomiting. This powerful medication, manufactured by the reputable pharmaceutical company Pfizer, contains ondansetron as the active ingredient. Ondansetron is a serotonin receptor antagonist that works by blocking the production and release of serotonin, a chemical in the body that is known to trigger nausea and